Tuscany Graphite

Description

Andesite (from the Spanish Andes - the name of the Andes mountain system in South America) is an igneous volcanic rock of intermediate composition, normal alkalinity from the andesite family.

Mineral composition: Plagioclase, phenocrysts of feldspars, hornblende, biotite.

Color: Dark gray or nearly black.

Structure: Incomplete crystalline (porphyry), fine-grained. The groundmass is characterized by a pilotaxite structure formed by subparallel plagioclase laths.

Texture: Dense or porous, often fluid.

Specific gravity: 2.5 t / m3.

Occurrence: Volcanic flows and effusive domes.

Separation: Columnar, in case of underwater effusions - pillow.

Genesis: Effusive analog of quartz diorite. Kainotypic (unchanged) breed. Andesites are characteristic of mature, ensialic island arcs and active continental margins of the Andean type. Metaandesites are found in the post-Archean greenstone belts.

PHYSIOCHEMICAL PROPERTIES

Volume weight:	2500 kg / m³
Compressive strength:	up to 300 MPa
Flexural strength:	- MPa
Moisture absorption:	- %
Refractoriness:	-